Index: date.module
===================================================================
--- date.module	(revision 20)
+++ date.module	(working copy)
@@ -561,7 +561,7 @@
     // Add a getter callback to convert the date into the right format.
     $property['getter callback'] = 'date_entity_metadata_field_getter';
     unset($property['query callback']);
-    unset($property['setter callback']);
+    //unset($property['setter callback']);
   }
   if (!empty($field['settings']['todate'])) {
     // Define a simple data structure containing both dates.
@@ -586,7 +586,7 @@
       ),
     );
     unset($property['query callback']);
-    unset($property['setter callback']);
+    //unset($property['setter callback']);
   }
 }